need help: negative going pulse triggered circuit to generate 5V
hi guys,
im very new to electronic stuff. i just would like to know if is it possible to generate a 5V voltage from a single short pulse signal of 12V (50ns duration).
i need help for some sort of circuit to receive the 12V short pulse and have the circuit generate a steady 5V which i will use to power another TTL circuit.
i mean a 12V short pulse signal from an electronic coinslot that i have. i need to be able to generate a 5V from this to power another TTL based logic circuit which would in turn communicate with my PC via parallel port
Do you actually mean that the 12V/50nS pulse needs to power the Vcc of the circuit, or just trigger the 5V input in a circuit that is already powered by a 5V power supply?
50ns from an electronic coin slot??? I've used coin mechs (standard and electronic) and even built optical coin detectors - none of them had that brief of a pulse.
Do you actually mean that the 12V/50nS pulse needs to power the Vcc of the circuit, or just trigger the 5V input in a circuit that is already powered by a 5V power supply?
What type of coinslot is this that generates a 20-60nS pulse? Are you sure you're reading that spec sheet right? This is a whopping five orders of magnitude faster than any unit I'm familiar with.
i already did that and got the same result, i had a friend of mine bring it to school just to make sure of the pulse.
also, im not pointing out china in a bad way since im using mostly items from china. It's only there in the event that there maybe someone who also brought similar item's who could help me out. i have great respect to chinese because my boss is a chinese...
i already did that and got the same result, i had a friend of mine bring it to school just to make sure of the pulse.
also, im not pointing out china in a bad way since im using mostly items from china. It's only there in the event that there maybe someone who also brought similar item's who could help me out. i have great respect to chinese because my boss is a chinese...
i am currently in an internet cafe now so it would be difficult for me to make a simple circcuit and then attach a picture here.
basically what i wanna do is to generate an output that is suitable for the parallel port lets say for about 1 sec so that my software will be able to detect the generated signal from the coin mech
i have an idea but i don't know if it's possible so i'll just ask for your ideas
1)directly send the negative going output pulse to LM555 (configured as a monostable) trigger and then feed the output of the monostable to the parallel port
i am currently in an internet cafe now so it would be difficult for me to make a simple circcuit and then attach a picture here.
basically what i wanna do is to generate an output that is suitable for the parallel port lets say for about 1 sec so that my software will be able to detect the generated signal from the coin mech
i have an idea but i don't know if it's possible so i'll just ask for your ideas
1)directly send the negative going output pulse to LM555 (configured as a monostable) trigger and then feed the output of the monostable to the parallel port